2000A&A...354..229P

Theoretical spectral energy distributions were computed for a grid of hydrogen-deficient and carbon-rich model atmospheres of T_eff in the range of 5000-6250K and logg=1.0-0.0 by the technique of opacity sampling, taking into account continuous molecular band and atomic line absorption. These energy distributions were compared with the spectrum of V4334 Sgr (Sakurai's object) from April, 1997 in the wavelength interval 300-1000nm. We show that (1) the shape of the theoretical spectra depends strongly on T_eff, but only very weakly on the hydrogen abundance; (2) the comparison of the observed and computed spectra permits us to estimate T_eff≃5500K for V4334 Sgr in April, 1997, and its interstellar reddening (plus a possible circumstellar contribution) E_B–V≃0.70.